Back-pressure valve.



C. F. WALLACE & M. F. TIE RNAN.

BACK PRESSURE VALVE. APPLICATION FILED NOV. II, l9l6.

1 ,285,93 I. Patented Nov. 19, 1918.

STATES PATENT @F TCE.

CHARLES E. WALLACE, or NEW YORK, AND MARTIN r. TIERNAN, on NEW ROCHELLE.

' NEW YORK.

Specification 02 Letters Patent.

Original application filed March 26, 1815, Serial No. 17,122. Dividedand this application filed November 11, 1916. Serial No. 130,755.

To all whom it may concern.

Be it known that we, Ci'mnLEs F. WAL- LACE and MARTIN F. TIERNAN,citizens of the United States, residing at Tompkinsville, borough ofRichmond, city and State of New York, and New Rochelle, county ofWestchester and State of New York, respectively, have invented certainnew and useful Improvements in Back- Pressure Valves, of which thefollowing is a clear, full, and exact description.

This invention relates to constant back pressure valves, such asdisclosed in our application for patent filed March 26th, 1915, SerialNumber 17,122, of which this application is a division.- Saidapplication.

discloses apparatuses and processes for the treatment or the purifyingof water, etc., and one of the ob ects of the present invention is toprovide an automatic valve somewhat in the nature of a check valve, andwhich is constructed more particularly with reference to the control ofchlorin gas under pressure as'it passes through a line of piping to thepoint of application to the water to be treated or purified.

Another object of the invention is to provide such a device with adiaphragm operated needle valve, which is free from any form of packingor stufling box. Another object of the invention is to provide a valvewhich prevents water from backing up into.

the chlorin side of the apparatus in which said valve may be used. Otherobjects are to provide a simple, practical and eiiicient back pressureand control valve automatically operated by gas or fluid pressure in themanner and for the purpose to be hereinafter more fully set forth.

These being among the objects of the present invention, thesame'consists of certain features of construction and combinations ofparts to be hereinafter described and then claimed with reference to theaccompanying drawings illustrating a desirable embodiment of theinvention, and in which- Figure 1 is a side elevation; and

Fig. 2 is a vertical central section through the valve.

The objects of this invention are directed to the production of a valvewhich has a constant back pressure so as to result in a constant densityof the gas. Second, to

provide a means by which the gas will be filtered before it passesthrough the seat or orifice. Third, to so construct the valve that whenthe gas through it ceases to flow it w1l1 close tight and prevent waterfrom flowing'back through it, and, fourth, to so construct the devicethat. any water that may flow back through the valve seat will betrapped in a non-corrosive cup, so that when the gas flows again thetrapped water will be carried ofi.

The apparatus which may be used in connection with the improved valve isnot shown, as, for the purpose of illustrating the valve, only the inletand the outlet pipes are necessary. The gas line, as for chlorin gas forwhich the present valve is particularly adapted, delivers gas to thecasing of the back pressure valve device.

This device preferably comprises two casing sections 136, 137, which arerigidly fas- -being seated upon the central portion of the diaphragmwhile the upper end of the spring is positioned in a seat plate 144.,upon which bears a set screw 145 which is screwed into the centralportion of the casting 137. Clamped between the two sections or castings136, 137, is a silver. cup 146 which is located at the underside of thediaphragm 138. This cup divides the space below the diaphragm into alower chamber 147 communicating directly withthe gas inlet pipe 135 andan upper chamber 148 within the cup, and extending to the valve seat 140which is located at the apex of the cup. There are a plurality of holesor perforations 149 located in the rim of the cup 146, and through thesethe gas passes in small jets from the lower chamber 147 into the upperchamber 148. Preferably between the pipe 135 and the cup 146 there islocated in the chamber 147 a screen 150 of suitable filtering material.The outer edge of the Patented Novlt 1918.

,146 may trap and hold a limitedamount of with the proper operation ofthe valve.

sure is produced.

said screen is in contact with the casin section 136 while its apexclosely sufrroun s the upwardly projected. central part of section 136..it will be seen that the cup 146 serves to trap a slight leak of waterfrom the silver tube 142 should such occur whenthe chlorin is introducedinto water under pressure and that the filter 150' serves to str 'n outany foreign particles the gas w ich might lodge in the valve seat 140 aninterfejr'e n operation, the spring 143 is adjusted by the set screw 145so as to hold the needle valve against the valve seat at a predeterminedtension. Gas passing into the lower chamber 147 and thence into theupper chamber 148, through the perforations 149, will act to raise thevalve 139 when a suilicient pres- Said back pressure valve will actsomewhat in the nature of a check valve. It will be seen that althoughthe cup water which may back up through the pipe 142, it will do no harmas it will be. dis

charged when the gas is turned on from some point in the line forcontrolling the supply.

It is obvious that the invention is sus- 'cepti'ble of modification,asparts may be omitted, parts added, and parts substituted withoutdeparting from the spirit and scope thereof, as expressed in the claims.

What we claim as new is 1. Ar'back pressure valve, comprising incombination two chambers separated by a flexible diaphragm, one of themcontaining a valve proper operable by said diaphragm to control saidtrap opening.

2. A back pressure valve, comprising in combination two chambersseparated by a flexible diaphragm, one of them containing a pressuremedium and the other having two openings, a cup-like partition dividingthe latter chamber into two sub-chambers,

said partition being supported from its upper edge and its lower end,and being provided with an upper series of perforations and the lowerportion thereof constituting a trap, one of said openings being locatedinstances at the lower end of said trap and sufficiently below saidperforations to provide said trap, and a valve proper operable by saiddiaphragm to control said trap openhaving an upper series ofperforations and the lower portion of said partition constituting atrap, a valve-seat in the lower end of said trap, and a valve properoperable by said diaphragm, the casing section around said partitionhaving an inlet opening, and said valve proper controlling the openingof said valve-seat.

4. A back pressure valve, comprising in combination two chambersseparated by a flexible diaphragm, one of them containing a pressuremedium and the other having two openings, respectively for the inlet andoutlet of chlorin gas, a cup-like partition of sheet metal such assilver and dividing the latter chamber into two sub-chambers, saidpartition being provided with upper perforations and the lower portionthereof constituting a trap, one of said openings being located at thelower end of said trap, and a'valve proper operable by said diaphragm tocontrol said trap opening.

5. A back pressure valve, comprising in combination, two chambersseparated by a flexible diaphragm, one of them containing a pressuremedium, a trap in the other of sold chambers and having a series ofpertorations adjacent said diaphragm, one of said chambers havingoutside of said trap an inlet opening, and said trap having an outletopening, a filtering medium surrounding said trap and located betweensaid inlet opening and the said perforations of said trap, said trapbeing imperforate in the zone surrounded by said filtering medium, and avalve operable by said diaphragm to controlthe said outlet opening insaid trap."

Signed at New York, N. Y., this 8" day of November, 1916.

CHARLES F. WALLACE. MARTIN F. TIERNAN. Witnesses:

BEATRICE Mmvrs, ABRAM BERNSTEIN

